The fast charging speed of the Apple Watch depends on the charging cable and charger used. If you use a USB-C interface charging cable that supports fast charging, and it is paired with a charger that supports fast charging, the charging speed will be very fast. According to Apple's data, the Apple Watch S7 and S8, which support fast charging, only take 45 minutes to full 80% and 75 minutes to full 100%. However, if you use an ordinary USB-A interface charging cable, then even the charger that supports fast charging cannot achieve fast charging function. In addition, if the output current of the charger is insufficient or there is a problem with the wire, it will also affect the charging speed. Therefore, if you want the Apple Watch to charge quickly, it is recommended to use the original charger and cable, and make sure that the cable is intact. At the same time, make sure that the charger port of the Apple Watch is free of dust or dirt, which can also affect the charging speed.